/Engine/Source/Runtime/Engine/Classes/GameFramework/CharacterMovementComponent.h
If we have a movement base, get the velocity that should be imparted by that base, usually when jumping off of it. Only applies the components of the velocity enabled by bImpartBaseVelocityX, bImpartBaseVelocityY, bImpartBaseVelocityZ.
virtual FVector GetImpartedMovementBaseVelocity() const